Trip sheave



Oct. 31, 1944. E. v. MILLER TRIP S HEAVE Filed Aug. 26, 1943 Patented Oct. 31, 1944 "UNITED STATES P TENT/ E Elmer V. Miller, Duluth, Minn, assignor of onehalf to Albin Falk, Duluth, Minn.

Application August 26, 1943, Serial No. 500,175

3 Claims. (01. 254 193) This invention relates to a line supporting sheave such as may be used upon outrigger booms or poles in the art of trolling for fish and through which sheave a fishing line is wove and suspended from the outboard extremity of the outrigger the same being employed usually when a, plurality of lines are trawled from a single boat and each controlled by a different fisherman.

Underthese circumstances it is well known to be desirable that in the event of a strike on such instantly freed, for individual attention by the fisherman, thus the desirability of a practicable trip sheave of the instant type.

The principal object sought in this invention is the production of such a sheave. Another object is to provide one readily adjustable in respect to the required stress on the line being held to cause the tripping element of the sheave to function relatively thereto as may be desired a line, or the snaging of same, that the line be and simplicity of construction is still another means upon the opposite or lower extremity for registration with that portion directly and permanently associated with the sheave 3.

The sheave is rotatably supported upon the short journal 4 fixed within the opposed spaced side walls forming the sheave block proper and is characteristic in this respect in that the inner face of each side wall 5 and 6 is stepped or recessed just the diameter of, and to let the sheave fit within such stepped portion substantially the depth of the outer extremity of the side flanges of the sheave, this being to insure against liability of the line carried thereby getting in between the sheave and side walls of the block in which it is mounted.

The lower extremities of the side walls of the block are permanently united as by the relatively heavy rivet l, or the like, and their upper extremities are normally held spaced the same distance apart by the central downwardly projecting member 8 formed integral with the body I and with which the upper extremity of the block is registerable.

The so-called outer wall 5 is formed upon its uppermost outerface with a knob-like extension 9 into the upper fiat face of which is installed the externally threaded dowel pin III, the extending upper portion of which registers within a similarly shaped hole in the lower face of the body portion I as clearly seen in Figure 2; of the drawing.

The inner wall 6 of the block has formed integral therewith and upon its outer face just above the journal bearing, the two spaced lugs II and I2 for the reception and pivoted connection 20 of the lower end of the suspending rod I3 which extends upwardly into and through the body portion I. The hole for the reception of this rod in the body portion is stepped, that is the lower portion being of a size to just snugly fit the rod I3 and the upper portion somewhat larger to similarly fit the upper enlarged end of the rod, there being sufficient of the larger portion of the hole below the enlarged portion of the rod to permit of the latter readily falling when the sheave is tripped to allow the block with the sheave to freely drop away to its pivotally suspended position as at 2| on the end of the rod I3.

The enlargement of the upper end of the rod I3 is to provide ample stock for frictional contact of the spring actuated ball I4 mounted ,within the transverse bore or hole I5 which is internally threaded at its outer extremity for the threaded plug or cork I6 against which the expansive helical spring II abuts when functioning as yieldable holding means for the ball. The plug being screwthreadedly mounted Within the hole I5 and having a slot therein for operation by a screw driver provides ideal means for regulating the tripping action of the sheave in respect to the stress on the line being held, and the result is that I have provided an exceedingly simple, strong, durable and cheap trip sheave for the purpose intended.

Thus when a fishing line being trolled with through such a sheave, set to trip at a certain predetermined stress upon the catching end of the line with the opposite end being held and controllable from the boat is abnormally jerked upon and the sheave tripped thereby, as previously explained, the two body portions of the device will instantly separate sufiiciently to allow the sheave block to assume any position pivotally with is then in the hands for control by the fisherman as desired.

Having thus described my invention, what I claim and desire by Letters Patent is:

1. In a line holding trip sheave of the type described; a main supporting body portion having means upon one end thereof for fixed suspension from a stationary object, a line holding sheave and block therefor depending from the opposite end of said body portion, means for pivotally supporting said sheave and block from one side of said body portion, said pivotal supporting means being reciprocable within said body portion, and holding means for said pivotal supporting means carried by said body portion and releasable by abnormal stress upon said line suflicient to permit said block to pivot upon said support and thereby free said line.

2. In a trip sheave for holding a bight of a line;

a main body portion,la sheave, a block for said sheave, reciprocable means within said body portion for pivotal support of said sheave block, and spring controlled holding means within said body portion in cooperative engagement with said reciprocable means for automatic release of same by abnormal stress upon said bight.

3. In a trip sheave for folding a bight of a line; a main body portion, a sheave, a block for said sheave, reciprocable means Within said body por-- tion for pivotal support of said sheave block, spring controlled holding means within said body portion in cooperative engagement with said reciprocable means for automatic release of same by abnormal stress upon said bight, and doweling means for stabilization of the cooperative union of said sheave block and said body portion in their normal line holding position.

ELMER V. Mill-ER. 

